I have a Portrait Painting Lesson featuring a work I did of my 19 year old son while he was fishing at the age of four, up
on WetCanvas.Com

The lesson would be practical for acrylics, oil...any medium really. What would be very useful in letting your students
read through it is that they will see that artists don't simply throw things together, but carefully think things thru and
manipulate design/composition elements. There is a great deal of teaching on the use of color and the color wheel in this
lesson. It would help to have a color wheel in view while viewing the lesson.
here is the url...
http://www.wetcanvas.com/ArtSchool/Color/Bobber/